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On each of those 3 ports (rebooting ones), the voltages oscilates between 0.3V and 0.9V, and one time it reached (very, very quickly 2V and then continuated to oscilate from 0.3V to 0.9V
Sorry for the delay, but I had a flood in the store and this has been very difficult. I only replaced it today, and It turned out, it was the UB300 damaged.
It's working again.
Thanks!